If the position you want to calculate does not have latitude: sin D = sin E. This situation will occur for the Sun, the nodes and the cusps of the houses. In that case you only need to know the longitude and Epsilon. (See Oblique angle of the ecliptic).Ī special situation occurs if the point for which you want to calculate the declination does not have any latitude. To calculate the value for the declination you need to know the longitude and the latitude and also Epsilon, the angle between equator and ecliptic. You define the declination of the shown star by measuring the distance from the equator to that star alongside a circle that is perpendicular to the equator (an hour circle). The position as measured alongside the equator, starting at the point 0 degrees Aries, is the right ascension. Think about parallel aspects, the use of declinations in archaeo-astronomy and the system defined by Kt Boehrer.īy Tfr000 (talk) 15:34, 15 June 2012 (UTC) (Own work), via Wikimedia CommonsIn the diagram you see the equator defined in green. But the declination has always been an important factor in the delineation. We do not use right ascension directly in astrology it is mainly an aid for some calculations. And in that case there is also a deviation which we call declination. That is the position on the heavenly equator. Instead of using longitude you can define a planetary position also in right ascension. But planets are not always exactly positioned on the ecliptic but a bit above or underneath it. In the drawing of your chart you will see the longitude, which is the position on the ecliptic. You can define the positions of a planet or other point in several ways.

Astrology parallel calculator